/** 
 * ================================================================================
 * 		Project		: Kompas Bola
 * 		File		: ImageLoader.java
 * 		Description	: Load Image Helper
 * 		Called		: All
 * ================================================================================
 * */
package com.kompas.bola.application.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import com.kompas.bola.application.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class ImageLoader {
	/** =========================================================================== */
	MemoryCache memoryCache 					= new MemoryCache();
	FileCache fileCache;
	private Map<ImageView, String> imageViews 	= Collections
												.synchronizedMap(new WeakHashMap<ImageView, String>());
	ExecutorService executorService;
	Context mContext;
	Bitmap bitmap;
	AnimationDrawable frameAnimation;
	private int i_size;
	/** =========================================================================== */
	public ImageLoader(Context context) {
		fileCache 								= new FileCache(context);
		mContext 								= context;
		executorService 						= Executors.newFixedThreadPool(5);
	}
	/** =========================================================================== */
	private int mTag 							= 0;
	/** =========================================================================== */
	public synchronized void DisplayImage(String url, ImageView imageView,
			int tag) {

		this.mTag 								= tag;
		
		if (mTag == 1 || mTag == 4) {
			i_size 								= Constants.MAX_THUMBIMAGE_SIZE;
		} else {
			i_size 								= Constants.MAX_IMAGE_SIZE;
		}
		
		imageViews.put(imageView, url);
		bitmap 									= memoryCache.get(url);
		
		if (bitmap != null) {
			imageView.setImageBitmap(bitmap);
		} else {
			queuePhoto(url, imageView);
			imageView.setScaleType(ScaleType.CENTER);
		}
	}
	/** =========================================================================== */
	private void queuePhoto(String url, ImageView imageView) {
		PhotoToLoad p 							= new PhotoToLoad(url, imageView);
		executorService.submit(new PhotosLoader(p));
	}
	/** =========================================================================== */
	public Bitmap getBitmap(String url) {
		File f 									= fileCache.getFile(url);
		
		Bitmap b 								= decodeFile(f);
		if (b != null)
			return b;

		try {
			Bitmap bitmap 						= null;
			URL imageUrl 						= new URL(url);
			HttpURLConnection conn 				= (HttpURLConnection) imageUrl
												.openConnection();
			conn.setConnectTimeout(30000);
			conn.setReadTimeout(30000);
			conn.setInstanceFollowRedirects(true);
			InputStream is 						= conn.getInputStream();
			OutputStream os 					= new FileOutputStream(f);
			Utils.CopyStream(is, os);
			os.close();
			bitmap 								= decodeFile(f);
			return bitmap;
		} catch (Throwable ex) {
			ex.printStackTrace();
			if (ex instanceof OutOfMemoryError)
				memoryCache.clear();
			return null;
		}

	}
	/** =========================================================================== */
	public Bitmap decodeFile(File f) {
		try {
			BitmapFactory.Options o 			= new BitmapFactory.Options();
			o.inJustDecodeBounds 				= true;
			FileInputStream stream1 			= new FileInputStream(f);
			BitmapFactory.decodeStream(stream1, null, o);
			stream1.close();

			// Find the correct scale value. It should be the power of 2.
			final int REQUIRED_SIZE 			= i_size;
			int width_tmp 						= o.outWidth, 
					height_tmp 					= o.outHeight;
			int scale 							= 1;
			
			while (true) {
				if (width_tmp / 2 < REQUIRED_SIZE
						|| height_tmp / 2 < REQUIRED_SIZE)
					break;
				width_tmp /= 2;
				height_tmp /= 2;
				scale *= 2;
			}

			BitmapFactory.Options o2 			= new BitmapFactory.Options();
			o2.inSampleSize 					= scale;
			FileInputStream stream2 			= new FileInputStream(f);
			Bitmap bitmap 						= BitmapFactory.decodeStream(stream2, null, o2);
			stream2.close();
			return bitmap;
		} catch (Throwable e) {
			// TODO: handle exception
			e.printStackTrace();
			if (e instanceof OutOfMemoryError)
				memoryCache.clear();
			return null;
		}
	}
	/** =========================================================================== */
	private class PhotoToLoad {
		public String url;
		public ImageView imageView;

		public PhotoToLoad(String u, ImageView i) {
			url 								= u;
			imageView 							= i;
		}
	}
	/** =========================================================================== */
	class PhotosLoader implements Runnable {
		PhotoToLoad photoToLoad;
		PhotosLoader(PhotoToLoad photoToLoad) {
			this.photoToLoad 					= photoToLoad;
		}

		@Override
		public void run() {
			if (imageViewReused(photoToLoad))
				return;

			Bitmap bmp 							= getBitmap(photoToLoad.url);
			if (bmp != null) {
				memoryCache.put(photoToLoad.url, bmp);
				if (imageViewReused(photoToLoad))
					return;
				BitmapDisplayer bd 				= new BitmapDisplayer(bmp, photoToLoad);
				Activity a 						= (Activity) photoToLoad.imageView.getContext();
				a.runOnUiThread(bd);
			}
		}
	}
	/** =========================================================================== */
	boolean imageViewReused(PhotoToLoad photoToLoad) {
		String tag 								= imageViews.get(photoToLoad.imageView);
		if (tag == null || !tag.equals(photoToLoad.url))
			return true;
		return false;
	}
	/** =========================================================================== */
	class BitmapDisplayer implements Runnable {
		Bitmap bitmap;
		PhotoToLoad photoToLoad;

		public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
			bitmap 								= b;
			photoToLoad 						= p;
		}

		public void run() {
			if (imageViewReused(photoToLoad))
				return;
			if (bitmap != null) {
				photoToLoad.imageView.setBackgroundResource(0);
				photoToLoad.imageView.setImageBitmap(bitmap);
				if (mTag == Constants.SCALETYPE_FIT_XY) {
					photoToLoad.imageView.setScaleType(ScaleType.FIT_XY);
				} else if (mTag == Constants.SCALETYPE_FIT_CENTER) {
					photoToLoad.imageView.setScaleType(ScaleType.FIT_CENTER);
				} else if (mTag == Constants.SCALETYPE_CENTER_CROP) {
					photoToLoad.imageView.setScaleType(ScaleType.CENTER_CROP);
				} else {
					photoToLoad.imageView.setScaleType(ScaleType.FIT_START);
				}
			} else {
				Drawable drawable 				= mContext.getResources().getDrawable(
												R.drawable.new1);
				photoToLoad.imageView.setImageDrawable(drawable);
			}
		}
	}
	/** =========================================================================== */
	public void clearCache() {
		memoryCache.clear();
		fileCache.clear();
	}
	/** =========================================================================== */
}
